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Segments - Revenue from External Customers by Products and Services (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenue from External Customer [Line Items]    
Net sales $ 573.3 $ 559.6
Batteries    
Revenue from External Customer [Line Items]    
Net sales 524.5 503.1
Other    
Revenue from External Customer [Line Items]    
Net sales $ 48.8 $ 56.5